Former Pakistani prime minister Nawaz Sharif (R) and his newly-named party candidate for the upcoming presidential election Saeed uz Zaman Siddiqui (L) arrive at a press conference in Islamabad on August 25, 2008. Sharif said his party had decided to quit Pakistan's ruling coalition over differences on the restoration of judges sacked by ex-president Pervez Musharraf. (AFP/Farooq Naeem)

Former Pakistani prime minister Nawaz Sharif (R) and his newly-named party candidate for the upcoming presidential election Saeed uz Zaman Siddiqui (L) arrive at a press conference in Islamabad on August 25, 2008. Sharif said his party had decided to quit Pakistan's ruling coalition over differences on the restoration of judges sacked by ex-president Pervez Musharraf. (AFP/Farooq Naeem)

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Nawaz Sharif (R), Pakistan's former prime minister, walks next to his party's nominated candidate for president, former chief justice Saeeduzzaman Siddiqui (L), after a news conference in Islamabad August 25, 2008. (Reuters/Mian Khursheed)

Nawaz Sharif (R), Pakistan's former prime minister, walks next to his party's nominated candidate for president, former chief justice Saeeduzzaman Siddiqui (L), after a news conference in Islamabad August 25, 2008. (Reuters/Mian Khursheed)

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Former Prime Minister Nawaz Sharif gestures during a press conference in Islamabad, Monday, August 25, 2008. Pakistan's ruling coalition collapsed Monday, torn apart by internal bickering just a week after it drove US ally Pervez Musharraf from the presidency. Nawaz Sharif, announced Monday that he was pulling out of the 5-month-old alliance because it failed to restore judges ousted by Musharraf or agree to a neutral replacement. (AP Photo/Emilio Morenatti)

Former Prime Minister Nawaz Sharif gestures during a press conference in Islamabad, Monday, August 25, 2008. Pakistan's ruling coalition collapsed Monday, torn apart by internal bickering just a week after it drove US ally Pervez Musharraf from the presidency. Nawaz Sharif, announced Monday that he was pulling out of the 5-month-old alliance because it failed to restore judges ousted by Musharraf or agree to a neutral replacement. (AP Photo/Emilio Morenatti)

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Former Pakistani prime minister Nawaz Sharif addresses a press conference in Islamabad on August 25, 2008. Sharif quit Pakistan's ruling coalition over differences on the reinstatement of judges sacked by former president Pervez Musharraf and on who should replace him. (AFP/Asif Hassan)

Former Pakistani prime minister Nawaz Sharif addresses a press conference in Islamabad on August 25, 2008. Sharif quit Pakistan's ruling coalition over differences on the reinstatement of judges sacked by former president Pervez Musharraf and on who should replace him. (AFP/Asif Hassan)